refactor(rm/linux): improve code readability by splitting long assignment line

Break the long `error` assignment into two lines to enhance code formatting and maintainability, aligning with style guidelines for better legibility in the `handle_unlink` call.

Author: mattsu2020

src/uu/rm/src/platform/linux.rs

@@ -437,7 +437,8 @@ pub fn safe_remove_dir_recursive_impl(
                 pb.inc(1);
             }
             if let Some(ref fd) = current_fd {
-                error = handle_unlink(fd, entry_name.as_ref(), &entry_path, false, options) || error;
+                error =
+                    handle_unlink(fd, entry_name.as_ref(), &entry_path, false, options) || error;
             }
         }
     }